CCTV News: Looking up at the sky, from the Beidou Star Orientation to the Beidou Satellite Navigation, we have witnessed the perfect integration of ancient human wisdom and the power of modern science and technology. According to the "Beidou Satellite Navigation System Development Plan until 2035" released at the end of 2024, my country will complete key technology research on the next-generation Beidou system in 2025, and complete the construction of the next-generation Beidou system in 2035. In the new year, what core technologies are the scientific research team working on, and what new hard-core capabilities will the next-generation Beidou system possess?

At the Microsatellite Innovation Institute of the Chinese Academy of Sciences, researchers are conducting on-orbit monitoring of the two final satellites of Beidou-3, which will just be launched in 2024.

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The Beidou-3 satellite constellation consists of three types: medium earth orbit satellites, geostationary orbit satellites and inclined geosynchronous orbit satellites. The two latest Beidou-3 final satellites launched are medium-circle earth orbit satellites. After being connected to the network, they will further improve the reliability of the Beidou-3 global satellite navigation system and service performance such as positioning, navigation and timing, and global short message communication. In supporting While the Beidou system is operating stably and Beidou is being applied on a large scale, relevant tests will be conducted for the next-generation Beidou navigation satellite technology upgrade. Breakthroughs in key core technologies will allow Beidou to shine in the sky

Beidou system is the largest system built so far in my country, with the widest coverage, the highest service performance requirements, and the most closely related to people's lives. The huge and complex aerospace system is also a major achievement of more than 400 units and more than 300,000 scientific researchers across the country. Over the past decades, breakthroughs in key core technologies such as time and frequency systems, inter-satellite link technology, and aerospace processors, and the seizure of technological commanding heights, have allowed the Beidou system to shine in the sky and truly enter our production and life.

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The time-frequency system is called the "heart" of the Beidou system, providing reference time-frequency signals for the ground operation control system. Starting from Beidou-1, the time-frequency system developed by the Shanghai Observatory of the Chinese Academy of Sciences has been providing continuous and stable time-frequency signals for the Beidou system, forming Beidou Time. In the laboratory, scientific researchers are debugging a new type of hydrogen atomic clock, which is also the core equipment of the time-frequency system. Its performance indicators directly determine the positioning accuracy of the navigation system.

From the initial purchase of atomic clocks from other countries, to the independent development of rubidium (RU two-tone) atomic clocks, to higher-precision hydrogen atomic clocks, the "heart" of the Beidou system is becoming more and more important. The stronger. Chief Engineer Lin Baojun said that although the scientific research team is already studying a new type of atomic clock with higher accuracy than the hydrogen atomic clock, the process of putting the first hydrogen atomic clock into space is still vivid in our minds.

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There is an unwritten rule in the aerospace field that the proportion of new technologies used in satellites generally does not exceed 30%. However, this bold and innovative team has made Beidou-3's first satellite more than 70% new in technology. In addition, the Beidou-3 development team also realized independent satellite diagnosis, isolation and repair for the first time in the world. New user needs can also be directly empowered on the Beidou-3 satellite; the development team's first inter-satellite link technology enables satellite measurement and control Coverage increased from 30% As high as 100%, global navigation accuracy can be guaranteed even when ground stations are insufficient; the use of domestic Loongson anti-radiation chips fills the gap in domestic aerospace processors, making core components truly autonomous and controllable, allowing Beidou has a Chinese core. Our country will build a Beidou comprehensive positioning, navigation and timing system

According to the "Beidou Satellite Navigation System Development Plan before 2035", in the future, on the basis of ensuring the stable operation of the Beidou-3 system, our country will Build a next-generation Beidou system with more advanced technology, more powerful functions, and better services.

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This is the chief executive of the Beidou-3 satellite system A poem written by chief designer Lin Baojun, "Manjianghong·Beidou-3 Final Star", records the key nodes in the construction of Beidou-3 and also sorts out the development of Beidou over the past 30 years.

The "Beidou Satellite Navigation System Development Plan before 2035" points out that the next generation of Beidou system will be "accurate and reliable, accessible at any time, intelligent, networked, and flexible" "With intergenerational characteristics, it provides meter-level to decimeter-level real-time, high-precision, high-integrity positioning, navigation and timing services covering open space on the earth's surface and near-earth space. According to the plan, my country will complete the key technology research of the next-generation Beidou system in 2025; launch three pilot test satellites around 2027 to carry out the next-generation new technology system test; start launching the next-generation Beidou system networking satellite around 2029, and launch the next-generation Beidou system networking satellite around 2035. Complete the construction of the next generation Beidou system.